Zipper attachment



FIG. 1 - is a front perspective view thereof;

FIG. 2 - is a front view thereof;

FIG. 3 - is a back view thereof;

FIG. 4 - is a side view thereof; and,

FIG. 5 - is an end view thereof.

The broken line showing of elements is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

The ornamental design for a zipper attachment, as shown and described. 